flexid

plural flexids

1. dentistryIn infolding of enamel that separates lophs on a lower tooth.

   Lower premolar tetralophodont, with two labial and two lingual flexids; tooth usually divided by one central flexid into two V-shaped lophs […]

   2005, Eileen A. Lacey, Philip Myers, Mammalian Diversification: From Chromosomes to Phylogeography, page 282

   1 more example

   A flexid or flexus is said to abut when the enamel of the flexid or flexus touches the enamel of the opposite side of the tooth. The distal end or termination of the flexid or flexus is described as flattened, rounded or narrowed.

   1955, Joseph Augustine Cushman, Raymond Cecil Moore, John Bernard Reeside, Journal of Paleontology, volume 29, page 130